(a) In computing any period of time prescribed by this subchapter, by order of the Board, or by other applicable statutory provision or rule, the period shall begin on the day after the act or the event considered and conclude at the end of the last day of such period unless the last day falls on a Saturday, Sunday, or official national or Texas state holiday, in which case the period shall run until the end of the next day which is not a Saturday, Sunday, or official national or Texas state holiday.     
      (b) A person shall be presumed to have received all pleadings and other notices upon a showing that such materials were sent to the respondent's last known address; the materials were sent by United States mail, first class postage prepaid; a return address was affixed to the exterior of the mailing materials and the materials were not returned; and in excess of seven days has elapsed from placement of the materials into the United States mail.     
     Source Note:        The provisions of this §3.162 adopted to be effective January 8, 2002, 27 TexReg 165; amended to be effective October 18, 2009, 34 TexReg 7073